Master Blacksmithing was made available in World of Warcraft: The Burning Crusade. Master blacksmithing requires at least level 50 and 275 skill to train, permits progression up to 375 skill and allows access to the following plans (Note: The list is incomplete, as this is all from information from the Burning Crusade beta test):

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Zen Master Blacksmithing was introduced in Mists of Pandaria and increased the skill cap to 600. Zen Master Blacksmithng requires at least level 80 and skill level 500 to learn. A large number of new recipes were added which are found from a number of sources.

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Draenor Master Blacksmithing was introduced in Warlords of Draenor and increased the skill cap to 700. Draenor Master Blacksmithng requires at least level 90 and skill level 600 to learn. A several new recipes were added which are found from a limited number of sources. Unlike previous expansions aspiring Draenor Master blacksmiths will have to get a Draenor profession book for blacksmithing ([Draenor Blacksmithing]) to start advancing.